Indexed by:期刊论文
Date of Publication:2021-03-04
Journal:ENERGY
Volume:149
Page Number:697-708
ISSN No.:0360-5442
Key Words:Exergy analysis; Exergy destruction sources; Combustion regime; Low-temperature heat release; Combustion temperature; Equivalence ratio
Abstract:The exergy destruction sources of different engine combustion regimes are investigated. The results indicate that chemical reaction is the largest sources of exergy destruction. Although the exergy destruction due to chemical reaction in conventional diesel combustion (CDC) engines is the lowest, its total exergy destruction is the largest. The transition from low-temperature heat release (LTHR) to high temperature heat release (HTHR) accumulates substantial exergy destruction, so adopting one-stage heat release fuels without LTHR is favorable to reduce exergy destruction. Higher combustion temperature benefits to reduce exergy destruction, and the required combustion temperatures to achieve the same exergy destruction fraction are different for various combustion regimes. With the increase of equivalence ratio towards the stoichiometric ratio, the exergy destruction fraction decreases due to higher combustion temperature. When the equivalence ratio exceeds the stoichiometric ratio, equivalence ratio itself plays a more negative effect, leading to larger exergy destruction fraction. Thus, the lowest exergy destruction fraction is at the stoichiometric combustion. Overall, for different combustion regimes, different strategies should be accordingly adopted to reduce exergy destruction, and effective control over the magnitude and stratification of combustion temperature is important to realize low exergy destruction, high fuel efficiency, moderate combustion rate, and low emissions simultaneously. (C) 2018 Elsevier Ltd. All rights reserved.
Associate Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates
Gender:Male
Alma Mater:大连理工大学
Degree:Doctoral Degree
School/Department:能源与动力学院
Discipline:Power Engineering and Engineering Thermophysics
Business Address:能源与动力学院809
Contact Information:15140422034
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